cuso4ceo2tio2sio2和cr2so43tio2催化剂催化氧化no性能分析word格式论文.docxVIP

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cuso4ceo2tio2sio2和cr2so43tio2催化剂催化氧化no性能分析word格式论文.docx

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cuso4ceo2tio2sio2和cr2so43tio2催化剂催化氧化no性能分析word格式论文

AbstractNOxisoneofthemostimportantpollutants,generatedmainlyfromtheburningof fossilfuel,withNOaccountingforover90%ofthefuelgas.However,duetoits incapacityofbeingdissolvedinthewater,adirectabsorptionofNOisalwaysaproblem. IntheremovalofNOxfromfluegasbycatalyticoxidation,50%~60%ofNOmustbe oxidizedtoNO2whichwillbeabsorbedinafurtherstep,andarelativelyhigher absorptionefficiencyofNOxisconsequentlyobtained.Bythistechnique,a simultaneouslydesulfurizationanddenitrationisrealized.Thustheresearchonthe catalystsfortheoxidationofNOtoNO2hasdrawnmuchattentionbecauseofthehigh priceofgeneraloxidant(O3/KMnO4).Suchresearchwillleadtoasignificantdecreasein therunningcost.Inthepresentpaper,catalystsofCuSO4-CeO2/TSandCr2(SO4)3/TiO2were prepared andapplied for catalyticoxidation of NO in the presenceof excessive oxygen.The effectsofloading,calciningtemperature,Cu/Cemolarrate,spacevelocity, volumefractionsofNOandO2onCuSO4-CeO2/TScatalyticoxidationofnitricoxide werestudied,andtheresistancetopoisoningofH2OandSO2wasalsoinvestigated.The resultsshowedthattheoptimumcatalystcouldbeobtained,yieldingtoanoxidation efficiencyof67.5%atthefollowingconditions:thevolumefractionofNO500?10-6(?),O2 8%(?),spacevelocity10000h-1andreactiontemperature350℃.Whenthespacevelocitywas10000h-1and20000h-1,theoxidationratewasabout67%and53%, respectively,for40hstabilitytest.TheNOconversionratewasdepressedwith300×10-6 SO2(?) feeding,andstabilizedaround 24%afterreactionfor3h.Whenthefeeding of SO2 wascutoff,theactivitywasincreasedalittle,anditfinallyreachedto31%.ItwasindicatedthatthiscatalystcouldnotresisttothepoisoningofSO2.Theactivitywasalso decreasedwith10%H2O(?)feeding,andwasstabilizedtoaround45.4%.Theactivity was much worsein thepresenceof H2O and SO2, and the catalyst was deactivated.Theeffectofpreparedmethods,operationfactorsonCr2(SO4)3/TiO2catalytic oxidationofNOwerestudied,andtheresistancetopoisoningofSO2wasalso investigated.Theresultsshowedthattheoptimumcatalystcouldbeobtained,yieldingto anoxidationefficiencyof65%a